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Fair Value Measurements - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
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Estimate fair value [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Mortgage loans held for sale | $ 2,480,700,000 | $ 2,370,200,000 |
Mortgage servicing rights | 11,100,000 | 10,600,000 |
Estimate fair value [Member] | Recurring [Member] | Interest rate lock commitments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives not designated as hedging instruments | (31,600,000) | (135,800,000) |
Mortgage hedging instruments and commitments | (33,900,000) | (183,500,000) |
Estimate fair value [Member] | Recurring [Member] | Forward Sales Of MBS [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives not designated as hedging instruments | 137,900,000 | 317,800,000 |
Mortgage loans held for sale | 2,519,900,000 | 2,386,000,000 |
Mortgage servicing rights | 11,100,000 | 10,600,000 |
Mortgage hedging instruments and commitments | 153,600,000 | 330,200,000 |
Mortgage hedging instruments and commitments | (15,700,000) | (12,400,000) |
Interest rate lock commitments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest rate lock commitments | 2,300,000 | 47,700,000 |
Recurring [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Mortgage loans held for sale | 0 | 0 |
Mortgage servicing rights | 0 | 0 |
Recurring [Member] | Level 1 [Member] | Interest rate lock commitments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives not designated as hedging instruments | 0 | 0 |
Recurring [Member] | Level 1 [Member] | Forward Sales Of MBS [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives not designated as hedging instruments | 0 | 0 |
Recurring [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Mortgage loans held for sale | 2,469,100,000 | 2,356,100,000 |
Mortgage servicing rights | 0 | 0 |
Recurring [Member] | Level 2 [Member] | Interest rate lock commitments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives not designated as hedging instruments | 0 | 0 |
Recurring [Member] | Level 2 [Member] | Forward Sales Of MBS [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives not designated as hedging instruments | 137,900,000 | 317,800,000 |
Recurring [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Mortgage loans held for sale | 11,600,000 | 14,100,000 | $ 11,700,000
Mortgage servicing rights | 11,100,000 | 10,600,000 | 4,100,000
Recurring [Member] | Level 3 [Member] | Measurement Input, Prepayment Rate [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Servicing Asset at Fair Value, Amount | 0.10 |  |
Recurring [Member] | Level 3 [Member] | Measurement Input, Discount Rate [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Servicing Asset at Fair Value, Amount | 0.11 |  |
Recurring [Member] | Level 3 [Member] | Measurement Input, Default Rate [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Servicing Asset at Fair Value, Amount | 0.08 |  |
Recurring [Member] | Level 3 [Member] | Interest rate lock commitments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives not designated as hedging instruments | (31,600,000) | (135,800,000) | $ 17,200,000
Recurring [Member] | Level 3 [Member] | Forward Sales Of MBS [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives not designated as hedging instruments | $ 0 | $ 0 |

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- Definition Amount, after valuation allowance, of financing receivable held for sale and not part of disposal group. Excludes loan covered under loss sharing agreement and loan classified as investment in debt security. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481990/310-10-45-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 310 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481852/948-310-45-1 + Details
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